5-35
5 Troubleshooting
NJ-series CPU Unit Hardware User’s Manual (W500)
5-2 Troubleshooting
5
5-2-4 Error Descriptions
*1 This event code occurs for unit version 1.10 or later of the CPU Unit.
*2 For details, refer to I/O Operation for Major Fault Level Controller Errors on page 5-6.
Event name Data Not Saved to Battery-backup Memory Event code
100A0000 hex
*1
Meaning An error occurred in the software and data could not be saved in battery-backup memory during power-OFF process-
ing.
Source PLC Function Module Source details None Detection
timing
At power ON or
Controller reset
Error attributes Level Major fault Recovery Cycle the power
supply.
Log category System
Effects User program Stops. Operation
Stops.
*2
The variables with a Retain attribute and memory for CJ-
series Units in the DM, EM, and Holding Areas do not con-
tain the values from just before the power supply was
turned OFF. Unless suitable processing countermeasures
are implemented, normal user program execution or nor-
mal Unit operation may not be possible when the power is
turned ON next time.
System-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
An error occurred in the software. Perform the following:
• Check the values of retained vari-
ables and the retained areas in the
memory used for CJ-series Units
and change them to the correct val-
ues.
• If the system uses a Servomotor
with an absolute encoder, turn ON
the power supply, and then turn ON
the Servo and check the actual cur-
rent position of the axis.
None
Attached
information
None
Precautions/
Remarks
If this error occurs, the values of the following will be the values from the previous time the power supply was turned
ON.
• Retained variables (variables with a Retain attribute or variables in retained areas with AT specifications)
• Retained areas in the memory used for CJ-series Units
• Absolute encoder home offset data
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